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i GOT this ERROR when doing sampling stratify of a sample dataframe code is like this :

df = pd.DataFrame(dict(
    A=['a', 'a', 'a', 'b', 'c', 'c', 'c', 'a', 'b', 'b', 'b', 'c', 'a', 'a', 'b', 'b', 'b', 'c', 'c', 'c'],
    B=range(20)


 ))


df.sample(n=100, weights='A',replace=True)

it gives me this error:

TypeError: '<' not supported between instances of 'str' and 'int'

anyone can help?

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  • $\begingroup$ Weights are supposed to be numeric. What are you wanting the weights to do in this case? $\endgroup$ – Ben Reiniger Aug 7 '19 at 3:13
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Welcome to the site!

I've checked the issue, it's because you are trying to create a sample using a str variable.(df['A']). df.sample cannot create a sample by assigning weights to categorical variable.

I made a small work around i.e.,

df = pd.DataFrame(dict( A=['a', 'a', 'a', 'b', 'c', 'c', 'c', 'a', 'b', 'b', 'b', 'c', 'a', 'a', 'b', 'b', 'b', 'c', 'c', 'c'], B=range(20) ))

#converting the text into categorical codes which are in numeric
df['cat'] = df.A.astype('category').cat.codes

#creating a sample using newly created column
Output = df.sample(n=100,weights = 'cat',replace=True)

Output would have 100 records and created using 'cat' for weights.

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  • $\begingroup$ But these cat codes are more or less arbitrary, right? Why use them as weights? $\endgroup$ – Ben Reiniger Aug 7 '19 at 3:12
  • $\begingroup$ I'm trying to convert each category into a specific number based the cat values weights are assigned. Which is in turn similar to using A. $\endgroup$ – Toros91 Aug 7 '19 at 3:18

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